Abstract
In this article the variability of cortisol level in cows of different breeds (Holstein, red steppe, Simmental) and its relationship with types of stress resistance are considered. The study showed that the Holstein breed has cortisol limits of 30.27-184.12 nmol/l, with 11.11 % of cows assigned to the low type of stress tolerance, 18.52 % to the high type, and 70.37 % to the unstable type. In Red Steppe breed, cortisol limits ranged from 9.4-171.67 nmol/L, with 19.35 % of cows categorized as low type, 58.06 % as unstable and 22.58 % as high type. For Simmental breed, cortisol limits were 45.95-188.47 nmol/L, with 14.29 % of cows categorized as low type, 64.29 % as unstable and 21.43 % as high type. The obtained data indicate wide individual characteristics of animals and the presence of various stress situations. The relationship between high basal level of cortisol and stress has been established. Determination of cortisol in blood remains the most popular physiologic indicator
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References
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